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annotate Applications/Platforms/WebAssembly/WebAssemblyViewport.h @ 1769:a217140dd41a

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refactoring
author Sebastien Jodogne <s.jodogne@gmail.com>
date Wed, 12 May 2021 10:26:13 +0200
parents 9ac2a65d4172
children 3889ae96d2e9
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1 /**
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2 * Stone of Orthanc
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3 * Copyright (C) 2012-2016 Sebastien Jodogne, Medical Physics
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4 * Department, University Hospital of Liege, Belgium
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5 * Copyright (C) 2017-2021 Osimis S.A., Belgium
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6 *
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7 * This program is free software: you can redistribute it and/or
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8 * modify it under the terms of the GNU Affero General Public License
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9 * as published by the Free Software Foundation, either version 3 of
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10 * the License, or (at your option) any later version.
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11 *
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12 * This program is distributed in the hope that it will be useful, but
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13 * WITHOUT ANY WARRANTY; without even the implied warranty of
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14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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15 * Affero General Public License for more details.
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16 *
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17 * You should have received a copy of the GNU Affero General Public License
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18 * along with this program. If not, see <http://www.gnu.org/licenses/>.
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19 **/
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20
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21
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22 #pragma once
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23
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24 #include "../../../OrthancStone/Sources/OrthancStone.h"
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25
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26 #if !defined(ORTHANC_ENABLE_WASM)
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27 # error Macro ORTHANC_ENABLE_WASM must be defined
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28 #endif
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29
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30 #if ORTHANC_ENABLE_WASM != 1
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31 # error This file can only be used if targeting WebAssembly
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32 #endif
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33
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34 #include "../../../OrthancStone/Sources/Viewport/IViewport.h"
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35 #include "../../../OrthancStone/Sources/Viewport/IViewportInteractor.h"
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36
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37 #include <Compatibility.h>
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38
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39 #include <emscripten.h>
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40 #include <emscripten/html5.h>
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41
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42 #include <memory>
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43 #include <string>
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44 #include <vector>
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45 #include <boost/enable_shared_from_this.hpp>
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46
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47 namespace OrthancStone
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48 {
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49 class WebAssemblyViewport : public IViewport,
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50 public boost::enable_shared_from_this<WebAssemblyViewport>
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51
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52 {
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53 private:
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54 class WasmLock;
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55
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56 std::string canvasId_;
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57 std::string canvasCssSelector_;
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58 std::unique_ptr<ICompositor> compositor_;
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59 std::unique_ptr<ViewportController> controller_;
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60 std::unique_ptr<IViewportInteractor> interactor_;
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61 bool enableEmscriptenMouseEvents_;
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62 unsigned int canvasWidth_;
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63 unsigned int canvasHeight_;
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64
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65 static EM_BOOL OnRequestAnimationFrame(double time, void *userData);
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66
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67 static EM_BOOL OnResize(int eventType, const EmscriptenUiEvent *uiEvent, void *userData);
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68
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69 static EM_BOOL OnMouseDown(int eventType, const EmscriptenMouseEvent *mouseEvent, void *userData);
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70
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71 static EM_BOOL OnMouseMove(int eventType, const EmscriptenMouseEvent *mouseEvent, void *userData);
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72
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73 static EM_BOOL OnMouseUp(int eventType, const EmscriptenMouseEvent *mouseEvent, void *userData);
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74
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75 protected:
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76 void Invalidate();
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77
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78 void ClearCompositor()
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79 {
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80 compositor_.reset();
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81 }
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82
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83 bool HasCompositor() const
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84 {
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85 return compositor_.get() != NULL;
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86 }
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87
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88 void AcquireCompositor(ICompositor* compositor /* takes ownership */);
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89
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90 virtual void Paint(ICompositor& compositor,
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91 ViewportController& controller) = 0;
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92
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93 /**
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94 The second argument is temporary and should be deleted once the migration
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95 to interactors is finished. It should be set to "true" for new applications.
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96 */
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97 WebAssemblyViewport(const std::string& canvasId,
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98 bool enableEmscriptenMouseEvents);
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99
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100 void PostConstructor();
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101
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102
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103 /**
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104 * This method can be called to retrieve a cookie that can be passed to
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105 * C-style callbacks that expect the object to be passed as a void*
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106 *
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107 * This cookie is a resource and must be freed when it is guaranteed
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108 * not to be used anymore, with ReleaseObjectCookie
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109 */
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110 void* CreateObjectCookie();
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111
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112 /**
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113 * This static method can be used to dereference a cookie (i.e. retrieve
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114 * a pointer to the underlying object) that has been created with
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115 * WebAssemblyViewport::CreateObjectCookie()
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116 *
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117 * If this method returns NULL, it basically means that the
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118 * WebAssemblyViewport has already been deleted and that you should NOT
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119 * attempt to use it!
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120 *
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121 * This method never releases the cookie (for other in-flight callbacks
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122 * could possibly require to cookie to be valid)
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123 *
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124 * If this method is called AFTER ReleaseObjectCookie has been called on
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125 * the same cookie, the behavior is undefined and things will CERTAINLY
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126 * go wrong.
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127 *
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128 * NEVER call this method on a void* that has not been generated by the
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129 * CreateObjectCookie method of this class
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130 */
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131 static WebAssemblyViewport* DereferenceObjectCookie(void* cookie);
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132
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133 /**
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134 * This method must be used when the object cookie will not be used anymore.
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135 *
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136 * You must call it when you are certain that no entity will attempt to
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137 * dereference the cookie.
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138 */
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139 static void ReleaseObjectCookie(void* cookie);
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140
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141 void RefreshCanvasSize();
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142
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143 unsigned int GetCanvasWidth() const
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144 {
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145 return canvasWidth_;
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146 }
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147
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148 unsigned int GetCanvasHeight()
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149 {
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150 return canvasHeight_;
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151 }
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152
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153 public:
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154 virtual ILock* Lock() ORTHANC_OVERRIDE;
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155
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156 ~WebAssemblyViewport();
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157
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158 /**
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159 This method takes ownership
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160 */
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161 void AcquireInteractor(IViewportInteractor* interactor);
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162
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163 const std::string& GetCanvasId() const
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164 {
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165 return canvasId_;
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166 }
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167
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168 /**
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169 emscripten functions requires the css selector for the canvas. This is
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170 different from the canvas id (the syntax is '#mycanvasid')
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171 */
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172 const std::string& GetCanvasCssSelector() const
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173 {
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174 return canvasCssSelector_;
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175 }
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176
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177 void FitForPrint();
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178 };
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179 }